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ACCRUED EXPENSES OTHER CURRENT LIABILITIES (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
ACCRUED EXPENSES OTHER CURRENT LIABILITIES [Abstract]
Reduction in certain accrued expense and accounts payable	$ 0	$ 3,000	$ 0	$ 4,000

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- Definition

Reduction in Certain Accrued Expense and Accounts Payable

+ References

No definition available.

+ Details

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Namespace Prefix:	prpo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration